how to connect two LAN's???

hi,
can anyone tell me what kind of software or hardware is required if i wan t to connect two LAN's?????and how they should be connected?/

Are the Lan's local (like in the same building) or in two different locals.

If you are in the same location, you should be able to bridge the two lans via getting routers and switches. How large are these lans as one router can support assigning up to 255 ip's to computers/printers/other devices each, the rest is getting the switches.

If you need to add more than 255 devices, then you need to develop sub nets. (example, you have 1 master router that is connected to an outside pipeline like a T1 or T3. Then each department has a router that assigns IP's to PC's and printers, etc in their area. The department router is connected and obtains info from the Master router and this process is repeated. I need to find a realy good diagram and post it, but its about 2Am here and sleep is calling.

Now if they are in two seperate areas, a VPN like system may need to be considered which is a little out of my ball park.